Search results

  1. M

    Thickness of Mercruiser 140 Manifold at Drain Plug Hole

    CGforMongo, on Amazon, you could search for "Full Port Brass Mini Ball Valve 1/8 NPT Female X Male 600 PSI Rated W/Internal Viton Seat & Blow Out Proof Brass Stem" airshot, yes, the petcock was installed in my block drain when I bought the boat. I've dealt with the manifold drain all these...
  2. M

    Thickness of Mercruiser 140 Manifold at Drain Plug Hole

    Thank you both. Bondo, the ball valve threads are 1/2" long, so 1/8" to 1/4" of water could be left after draining, but the manifold is shaped so the drain is sort of a well, so it would be only very local to the drain hole. So it makes sense that even if that little bit freezes, it's not being...
  3. M

    Thickness of Mercruiser 140 Manifold at Drain Plug Hole

    1974 Harris Flote Bote Mercruiser 140 4-cyl 181 cu.in. s/n 3888148 Hello all, We've been doing a lot more fishing off the pontoon boat. This coming spring 2025, we're hoping to take it out earlier than usual. Here in Wisconsin, it will still drop well below freezing on some nights, so I will...
  4. M

    Stereo Head (pre-amp or passive) with Aux & USB Ports

    Hello, I've been searching all around the web and can't find what I'm looking for. I figure you guys will probably be able to point me in the right direction. What I want for my kids' wakeboat: Stereo Pre-amp (or passive) Head Unit Marine (better) or Car (fine) Aux Port to plug in MP3...
  5. M

    Power Trim System Problems

    1974 Mercruiser 140 s/n 388xxxx Mercruiser "Late Model I" Stern Drive s/n 390xxxx Hello, My sterndrive started pulling up when in reverse... I'd have to trim it back down. I went today to look at a reverse shifting problem (might be related), and when we took the support strap off the...
  6. M

    Shift Cable, I think

    1974 Mercruiser 140 s/n 388xxxx Mercruiser "Late Model I" Stern Drive s/n 390xxxx Hello, It's been 5 years to the month since I replaced the stern drive shift cable. Now I'm having this problem: Sometimes when shifting into reverse, my single-lever control will go past the shift position and...
  7. M

    Steering Cable Connection - Teleflex Cable, Mercruiser Sterndrive

    . Two questions about the sterndrive end of the new Teleflex steering cable... 1. I got a new steering tube which will thread inside of the locking nut on the cable, but I forgot to get the "wiper nut" for the other end of the steering tube--what part do I need, and can it have a zerk...
  8. M

    Steering System Replacement--Recommendations?

    My 1970's pontoon boat has a Mercruiser 140 with a "Late Model I" stern drive. The steering has gotten to be extremely stiff. I disconnected the cable from the sterndrive yoke and the sterndrive moves easily (I keep the fittings greased, as well). I took the steering box apart--as I recall it...
  9. M

    Prop with Insert?

    I'm used to Mercruiser props with the splined hole in the middle an integral part of the prop. I picked up a rebuilt prop and later found that the splined hole in this prop is part of an insert that can slide out. The outside of the insert is tapered like a cone and has 3 or 4 squared off...
  10. M

    Thread for Merc 140 Riser Plug?

    I need to tap the hole in my riser elbow, where the brass pipe plug is supposed to thread into. It's kind of jammed in there now. Does anyone know the thread size? If I have to go bigger, what's the next logical plug thread size? I'm not a thread size guy.... thanks.
  11. M

    Merc 140 Hydraulic Steering Conversion

    I've read lots of the "stiff steering" posts. My 1970's Merc 140 has stiff steering. The way my helm is mounted, there has to be a pretty sharp bend in the cable where it goes through the floor. I will detach at the drive arm and check the aluminum cable tube. If I end up looking at...
  12. M

    "Long Leg" Sterndrive?

    Does anyone make a "long leg" lower unit that fits a # 1 Mercuiser upper unit, or a long leg upper+lower replacement?
  13. M

    Interchange 2 Barrel Carbs?

    I've been thinking of picking up a used carb or two for parts or to try running. My 1974 Merc 140 (s/n 388xxxx) carburetor tag says Mercury Marine 1351-5203A1. I see used carbs with part numbers like 864940, 214715, 866141001 or 34-6118. Is there a compatibility chart somewhere that I can...
  14. M

    Rochester 2GC Carb Parts

    1974 Mercruiser 140 s/n 388xxxx Old man winter is coming and I winterized my boat before I solved the issue with the choke plate closing tightly when fully warm (discussed in other threads). Thought I'd try to pick up a few parts over the off season and try them in the spring before removing...
  15. M

    General Question About Pre-Oilers

    Over in the "no engine compression" thread, havasuboatman wrote, "If the motor sat for a year, you will want to pull the distributor, fashion a tool and spin the oil pump using a drill. That will pump oil throughout all of the oil passageway and bearings before you do anymore damage to them." I...
  16. M

    Instead of a Boroscope?

    I'd like to get a peek inside my cylinders so I looked online at boroscope prices--those things are pricey! Does anyone use a different approach, like maybe a miniature videocam or some other idea? Just curious.
  17. M

    Remove Choke on Merc 140

    I'm going to try my Merc 140 with the choke plate removed. The messed up choke also sets the fast idle cam incorrectly when the engine is warm. I set my warm-up RPM manually anyway. What's the best way to fix the idle setting... fix the cam in place with a serrated lock washer or remove the...
  18. M

    Winterizing Merc 140 - draining, cyl oil, drive belt

    1974 Mercruiser 140 s/n 388xxxx Mercruiser "Late Model I" Stern Drive s/n 390xxxx Hopefully I won't have to winterize for another month or more, but I'm trying to get ready now. I've been reading the "Winter Storage" pages of the manual for my I/O. That is Mercruiser Service Manual Number 2...
  19. M

    Choke Housing Vented?

    1974 Merc 140 s/n 390xxxx My choke has the cover plate with a bimetallic coil on the inside. It has the copper riser tube that lets exhaust into the choke housing. Is the choke housing supposed to be vented? If so, where is the vent? I think mine might be plugged. original thread here...
  20. M

    Choke Plate Closing & Carb Dumping Fuel (leaky carb float)

    1974 Mercruiser 140 s/n 388xxxx Mercruiser "Late Model I" Stern Drive s/n 390xxxx Rochester 2-barrel carb with choke with heat tube from rocker cover Summary: Choke works right until engine fully warm, then choke plate ends up tightly closed with a lot of tension on the choke coil. Details...
Top